The Old Treasure Story (The Saint TV Series)

Plot
In a pub in Cornwall, the Saint meets 3 men, each of whom owns a third of a map which allegedly shows the whereabouts of sunken treasure in the West Indies. He joins their party to discover whether the treasure is a myth or reality. On arriving at the supposed location, he quickly realises there's a deadly rivalry among the men.

Origin
This episode was adapted from the short story of the same name from the 1955 book The Saint on the Spanish Main.